Introduce ARCH_NO_SYSDEV_OPS config option (v2)
Introduce Kconfig option allowing architectures where sysdev
operations used during system suspend, resume and shutdown have been
completely replaced with struct sycore_ops operations to avoid
building sysdev code that will never be used.
Make callbacks in struct sys_device and struct sysdev_driver depend
on ARCH_NO_SYSDEV_OPS to allows us to verify if all of the references
have been actually removed from the code the given architecture
depends on.
Make x86 select ARCH_NO_SYSDEV_OPS.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d57ddd7..b1cd5a9 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -71,6 +71,7 @@
select GENERIC_IRQ_SHOW
select IRQ_FORCED_THREADING
select USE_GENERIC_SMP_HELPERS if SMP
+ select ARCH_NO_SYSDEV_OPS
config INSTRUCTION_DECODER
def_bool (KPROBES || PERF_EVENTS)
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index d57e8d0..e9e5238 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -168,4 +168,11 @@
bool
default n
+config ARCH_NO_SYSDEV_OPS
+ bool
+ ---help---
+ To be selected by architectures that don't use sysdev class or
+ sysdev driver power management (suspend/resume) and shutdown
+ operations.
+
endmenu
diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index f6fb547..fbe72da 100644
--- a/drivers/base/sys.c
+++ b/drivers/base/sys.c
@@ -329,7 +329,7 @@
}
-
+#ifndef CONFIG_ARCH_NO_SYSDEV_OPS
/**
* sysdev_shutdown - Shut down all system devices.
*
@@ -524,6 +524,7 @@
return 0;
}
EXPORT_SYMBOL_GPL(sysdev_resume);
+#endif /* CONFIG_ARCH_NO_SYSDEV_OPS */
int __init system_bus_init(void)
{
diff --git a/include/linux/device.h b/include/linux/device.h
index 144ec13..ab8dfc0 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -633,8 +633,12 @@
/* drivers/base/power/shutdown.c */
extern void device_shutdown(void);
+#ifndef CONFIG_ARCH_NO_SYSDEV_OPS
/* drivers/base/sys.c */
extern void sysdev_shutdown(void);
+#else
+static inline void sysdev_shutdown(void) { }
+#endif
/* debugging and troubleshooting/diagnostic helpers. */
extern const char *dev_driver_string(const struct device *dev);
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 6618216..512e091 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -529,13 +529,19 @@
*/
#ifdef CONFIG_PM_SLEEP
-extern void device_pm_lock(void);
+#ifndef CONFIG_ARCH_NO_SYSDEV_OPS
+extern int sysdev_suspend(pm_message_t state);
extern int sysdev_resume(void);
+#else
+static inline int sysdev_suspend(pm_message_t state) { return 0; }
+static inline int sysdev_resume(void) { return 0; }
+#endif
+
+extern void device_pm_lock(void);
extern void dpm_resume_noirq(pm_message_t state);
extern void dpm_resume_end(pm_message_t state);
extern void device_pm_unlock(void);
-extern int sysdev_suspend(pm_message_t state);
extern int dpm_suspend_noirq(pm_message_t state);
extern int dpm_suspend_start(pm_message_t state);
diff --git a/include/linux/sysdev.h b/include/linux/sysdev.h
index 1154c29..8a75da5 100644
--- a/include/linux/sysdev.h
+++ b/include/linux/sysdev.h
@@ -33,12 +33,13 @@
const char *name;
struct list_head drivers;
struct sysdev_class_attribute **attrs;
-
+ struct kset kset;
+#ifndef CONFIG_ARCH_NO_SYSDEV_OPS
/* Default operations for these types of devices */
int (*shutdown)(struct sys_device *);
int (*suspend)(struct sys_device *, pm_message_t state);
int (*resume)(struct sys_device *);
- struct kset kset;
+#endif
};
struct sysdev_class_attribute {
@@ -76,9 +77,11 @@
struct list_head entry;
int (*add)(struct sys_device *);
int (*remove)(struct sys_device *);
+#ifndef CONFIG_ARCH_NO_SYSDEV_OPS
int (*shutdown)(struct sys_device *);
int (*suspend)(struct sys_device *, pm_message_t state);
int (*resume)(struct sys_device *);
+#endif
};